Ecto v2.1.0-rc.5 released

Elixir News & Announcements Elixir News
1

Hello everyone,

This past weekend we have released Ecto v2.1.0-rc.5, hopefully the last release candidate for Ecto v2.1: https://github.com/elixir-ecto/ecto/blob/master/CHANGELOG.md

If you were using “or_where/or_having” from previous RCs, note “or_where: ^keywords” changed behaviour in this last RC.

We have also released Postgrex 0.13-rc which includes a new API for extensions that is about 40% faster when running Postgrex queries.

16 Likes
2

Thank you very much for this, @josevalim!

I’ve noticed that you haven’t got a git tag for this version, which breaks the links from hexdocs. Just a heads-up!

1 Like
3

Done, thank you.

4

Question regarding dynamic expressions, don’t get how they work nor why do we need them. from changelog:

dynamic = false

dynamic =
  if params["is_public"] do
    dynamic([p], p.is_public or ^dynamic)
  else
    dynamic
  end

isn’t it means false([p], p.is_public or ^false). o_O

Regular non-dynamic code looks like

q = Post
q = 
  if params["is_public"] do
    q |>  where([p], p.is_public)
  else
    q
  end
5

@thousandsofthem imagine you need to go through a bunch of parameters in no particular order. For such, you ned to start with an initial value (in this case, false) and compose them arbitrarily until it is interpolated. The Ecto book also contains examples of where to use dynamic.

6

Thanks.
Still, false(..) looks counterintuitive, it feels wrong that i can apply () to boolean value
(i.e. dynamic = false; dynamic = dynamic(...))

7

Echoing @thousandsofthem, I’m inclined to think that there are two different semantics of dynamic in that snippet: one is a value (initialized as false and gets updated with the ifs) and another is a function/macro. Is that right?

8

Hrm, not quite. I will work on better examples.